durham



(Remodel.) aaneen-sheen.

y 7F. WJURHAM.V Steam Governor.

No. 239,469. l Patented March 29,1881.

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F/WQNDURHAM Steam Governor.

2 sheets-sheet 2.

(No Model.)

No. 239;'4e9-1 Patented Maren 29,1881.V

, UNITED STATES.

PATENT OFFICE.

FREDERICK w. DURHAM, oE BARNET, coUNrY or HERTs, ENGLAND.

STEAM-GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 239,469, dated March 2 9, 11881. Application filed January 13, 188]. (No model.) Patented in England March 2, 1880.

To all whom it mtr/y concern:

Be it'known that I, FREDERICK WILLIAM DURHAM, a citizen of England, residing at Barnet, `county VDHertS, England, have invented a new and useful Improved-Steam- Governor, (forwh'ich I haveobtained apatent in Great Britain, No. 911, hearin g date March 2,1880,) of which the following is aspecication.` t

My invention relates to the coustructionof steam-governors -for regulating the supply` of steam to steam-engines, for which Letters Patent of the United States were granted to Durham and Howse, dated March 27,1877, and to Koch and Durham, dated August 12, 1878.

According to my present improvements I simplify the mechanism of theappa-ratus described inthe specifications to the? saidpatents by the employment of the following arrangement: The spindle, receiving motion from the steam or other motor engine, `instead of being connected to the spindle carrying the revolvingv vanes or to the revolving casing of the iixed vanes throughsun and planet wheels, orothcrlsimilar mechanism,iscounected thereto by the intervention uof a second spindle or rod and a' spring or springs, so arranged that on an increase of the speed of the drivin g-spindle ,occurring the, resistance to` such increase offered by the vanes causes the spring to be compressed, contracted, or extended, so as to impart longitudinal motion tothe second spindle or rod, or to a screwed sleeveupon it, which, in its turn, actuates the throttle valve or slide `tot the regulating apparatus.

The arrangementot' the connection of the driving-spindle by the spring to the second spindle may be variously modified. Thus, according to one arrangement, the second spindle, which passes through the hollow spindle of the vanes, passes with its one end into a hollow in the end of the drivin g-spindle, which has a helical or oblique slot, into which a pin or stud on the second spindle passes.

the other end of which is connected to the vane-spindle,so that the drivin g-spindle drives the vane-spindle through the second spindle `T0 i this spring, or to a projection thereon, is `conl v nected the one end ot' a helical or volute spring,

and spring. Thus, on an increase of speed of 5o the driving-spindle occurring, the spring, in being contracted by reason of the relative motion between the driving-spindle and vanespindle, imparts longitudinal motion to the secondspindle by causing its stud to slide in the oblique slot, and this spindle consequently imparts motion to the slide ot' the controllingcylinder, to which it is, by preference, directly connected by a connection permitting its free rotation. i

Instead ,of using an oblique slot or groove in the driving-spindle, this maybe provided with a screw-thread of quick pitch working upon o r within a screw-thread on the second spindle; or the latter may be provided with a screw-thread workin g within an internalscrewthread on the hollow vane-spindle, through which it passes. f

`In the drawings, Figure l is a side view, Fig. 2 a plan, and Fig. 3 a part longitudinal 7o section, of the arrangement of the before-described apparatus which I employ by preference.

The shaft A, the pulleyB of which is driven l by the engine,.has a cylindrical barrel, C, on its end, into which passes theone end of a spindle, D, the other end ot which carries the cylindrical casingE, containing liquid, within which are the stationary vanes F, carried by the spindle G. The barrel C of the shaft A is con- 8o nected to the spindle D by means of a volute spring, H, the inner end of which is connected to D, while the outer end is connected to C.

i 'Ihe spindle D is formed with a screw-thread outside the barrel 0,0m whichis a screwed sleeve 8 5 or nut, I, connected to C by slotted arms I', through which pass top bolts or pins,G,screwed into C, so that while I is carried round by C `it is free to slide or work to and l'ro on D. The sleeve or nut I has a groove, P ,into whichf 9o takes alpin on one arm ot'l a bell-crank lever, K, having its pivot at K, and taking with its other arm into a groove on the slide-valve rod L of the steam-cylinderL. From this arrangement it will be seen that when rotary motion is imparted to the shaftA and barrel C in the direction of the arrow, Fig. 1, this motion will be imparted through the springI` H-to the spindle D and casing E, a certain resistance to the rotation of which is offered by the stationary vanes F acting in combination with theliquid in the casing. On an increase of speed of the spindle A taking place, the barrel G will turn somewhat relatively to the spindle D, on account of the resistance offered by the casing E to any sudden increase of the speed of D, and as C carries the sleeve or nut I round with it, it follows that this sleeve or nut will be screwed forward somewhat in the direction of the arrow upon D, thereby causing the lever K to depress the slide-rod L of the cylinder L', i

so as to admit steam into the latter and canse its piston-rod M to actuate the throttle or other valve of the steam-supply pipe of the engine to which it is connected, thereby reducing the speed of the engine again.

The sensitiveness of the apparatus to any increase of speed may be accurately adjusted to any required degree by adjusting, in the rst instance, the tension of the spring-connection at H between A and D. rlhis is effected by removing the screws O' and turning G round upon D until the spring H has acquired a certain amount of tension, whereupon the screws G' are passed through the slotted arms of I, and are screwed into whichever of theholes in C are then situated at those points, the screw-threads of D and I now preventing C from being turned back again upon D. Furthermore, the slide-valve rod L is held up so as to keep the slide-valve in the closed position by means of a spring at N, the tension of which is regulated by a screw, N', so that the slide-valve rod offers a certain regulatedamount of resistance to the downward motion which the lever K tends to impart to it on an increase of speed taking place. A scale, 0, is provided on the guide of the slide-valve rod, and an index is connected to the spring, as shown, by means of which the latter may be set to the exact tension corresponding` to the number of revolutions constituting the normal speed of the engine.

The apparatus is also made to indicate the number of revolutions actually performed by the engine, by connecting the spindle G of the vanes F to the one end of a volute spring, P, the other end of which is attached to a fixed barrel, Q. The outer face of this barrel is formed as a graduated dial, as shown in front view at Fig. 4, and the end of the spindle G carries a pointer, R.

It will be readily understood that as the resistance of the vanes to the rotation of the casing E at a certain speed ofthe engine will produce a certain degree of tension in the spring P, causing the spindle G, and consequently pointer R, to turn to a corresponding position in the barrel, then, on any increase of speed taking place, and consequently also of the resistance, the spindle Gr will turn somewhat farther, so as to put a corresponding increased tension on the spring, and the pointer will be made to turn in a corresponding manner upon the dial.

rllhe steam-cylinder L' is mounted on the framing by a trunnion, L2, the axis of which coincides with the'axis ofthe slide-valve rod L, so that it can be turned round into any p0- sition that may be required for connection with the steam-admission valve of the engine.

Having thus described the nature of my invention and in what manner the same is to be performed, I claim in respect of apparatus for regulating the supply of steam to steam-enginesl. A shaft driven by the engine,connected by a volute or other spring to a spindle whose rotation is resisted by the action of a casing containing liquid and vanes, either one of which is stationary while the other revolves, the said spindle having a screw-thread on which is a screwed sleeve or nut having a sliding connection to, but revolving with, the driving-shaft, so that on the latter being turned relatively to the screw-threaded spindle the sleeve or nut will slide upon the spindle and impart motion to the slide-valve rod of a steamcylinder actuating the steam-admission valve of the engine, substantially as herein described. f

2. The shaft A, driven by the engine, connected by a spring, H, with the screw-threaded spindle D, driving the casing E of the resistin g-fan, while a screw-threaded nut or sleeve, I, on the spindle D, carried round by the shaft A by a sliding connection, I', is connected by a lever, K, to the slide-valve rod L of a steamcylinder, L', actuating the throttle-valve of the engine, so that by a differential motion between shaft A and spindle D the sleeve or nut I will be worked forward, so as to move the slide-valve rod L and cause the pistonrod M of the cylinder L' to actuate the throttlevalve.

3. The combination of the shaft -A, barrel G, spring H, screw-threaded spindle D, connected to the resisting-fan, screw-threaded nut or sleeve I, lever K, slide-valve rod L, and adjustable spring-connection N N', all arranged and operating as herein set forth.

4. The combination of the shaft A, barrel C, spring H, screw-threaded spindle D, screwthreaded nut or sleeve I, casing E, vanes F, spindle G, connected by spring P to casing Q, and having a pointer, It, working over a graduated dial of the said casin g, all arranged and operating as herein set forth.

5. The combination of the shaft A, barrel C, spring H, screw-threaded spindle D, and screw-threaded nut or sleeve I, connected to barrel C by slotted arms I', and screws C', capable of being screwed into different holes on the circumference of C, for the purpose of adjusting the tension of the spring-connection between the shaft A and spindle D, as herein described.

6. In combination with the screw-threaded IOO IIO

sleeve or nut I, lever K, and slide-vaine rod L, seribing Witnesses, this 15th day of December, the cylinder L', mounted on a. trnnnion, L2, A. D. 1880.

Whose axis is in line with the axis of the slide- FREDERICK 4WILLIATN'I DURHAM. rod, so that the cylinder can be turned into Witnesses:

5 any desired position for connection with the J. WATT, A

throttle-Valve. JN. DEAN,

In testimony whereof I have signed my name Both of 17 Gmccmreh Street, London. to this speoication, in the presence of two sub- 

